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Thread: Missing RAM?

  1. #1
    Join Date
    Jan 2009
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    Question Missing RAM?

    Hi :

    Been trying to figure out a RAM memory puzzle. I am running Ubuntu 12.04 (64bit) with a dedicated graphics card (Nvidia) & 4GB of RAM. However, when I look at system info, only 2.9 GB of RAM is showing. This amount is verified when I run System Monitor, free, or htop. The 4 RAM sticks are seated properly as I checked my BIOS which shows the actual 4GB RAM.

    My question: where is the missing 1GB of RAM?
    :

  2. #2
    Join Date
    Jan 2007
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    3,202

    Re: Missing RAM?

    Does all 4 GB show in BIOS? What does lshw show?
    Intel Core i7-950 / Asus P6X58D-E / Nvidia GTX480 / siduction 64-bit on OCZ Revodrive SSD / KDE4.10.2/ Kubuntu 13.04

  3. #3
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    Re: Missing RAM?

    Hi dabl :
    Thanks for the reply!

    As to your inquiries: 1) Yes, 4GB of RAM showing in BIOS
    2) lshw shows banks 0-3 of DDR RAM
    :

  4. #4
    Join Date
    Jun 2009
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    Chicago Suburbs
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    Ubuntu 12.04 Precise Pangolin

    Re: Missing RAM?

    Then are you sure you are running 64 bit?

    32 or 64 bit
    Code:
    uname -a
    i386 or i686 = 32-bit
    x86_64 = 64-bit
    Code:
    lscpu
    For info on UEFI boot install & repair:
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to close thread when/if answered completely.







  5. #5
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    Re: Missing RAM?

    Hi oldfred :
    Thanks for the reply!

    uname -a shows Linux (my host name) 3.5.0-21-generic..x86_64 GNU/Linux
    :

  6. #6
    Join Date
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    Xubuntu 14.04 Trusty Tahr

    Re: Missing RAM?

    what does this return?
    Code:
    cat /proc/meminfo
    Check out my Blog about my life and computer software and hardware. http://ubuntuaddicted.blogspot.com/
    My YouTube channel:
    http://www.youtube.com/ubuntuaddicted

  7. #7
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    Re: Missing RAM?

    Hi dannyboy79 :
    Thanks for the reply!

    Here is the O/P of cat /proc/meminfo

    Code:
    XXXXXXXXXXXXX ~ $ cat /proc/meminfo
    MemTotal:        3081400 kB
    MemFree:          319540 kB
    Buffers:          253448 kB
    Cached:          1306564 kB
    SwapCached:         4716 kB
    Active:          1521772 kB
    Inactive:         964456 kB
    Active(anon):     579940 kB
    Inactive(anon):   353956 kB
    Active(file):     941832 kB
    Inactive(file):   610500 kB
    Unevictable:       19348 kB
    Mlocked:           19348 kB
    SwapTotal:       1997820 kB
    SwapFree:        1922100 kB
    Dirty:               484 kB
    Writeback:             0 kB
    AnonPages:        941640 kB
    Mapped:           209584 kB
    Shmem:              4276 kB
    Slab:             157788 kB
    SReclaimable:     131004 kB
    SUnreclaim:        26784 kB
    KernelStack:        3408 kB
    PageTables:        28912 kB
    NFS_Unstable:          0 kB
    Bounce:                0 kB
    WritebackTmp:          0 kB
    CommitLimit:     3538520 kB
    Committed_AS:    3785024 kB
    VmallocTotal:   34359738367 kB
    VmallocUsed:      315884 kB
    VmallocChunk:   34359388668 kB
    HardwareCorrupted:     0 kB
    AnonHugePages:         0 kB
    HugePages_Total:       0
    HugePages_Free:        0
    HugePages_Rsvd:        0
    HugePages_Surp:        0
    Hugepagesize:       2048 kB
    DirectMap4k:      162352 kB
    DirectMap2M:     2981888 kB
    :

  8. #8
    Join Date
    Apr 2009
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    Aotearoha
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    Ubuntu 10.04 Lucid Lynx

    Re: Missing RAM?

    Part of the GPU videoram has to be mapped into 32bit memory space if BIOS does not support 64bit BAR

    Chapter 9 of any nVidia driver readme..
    64-Bit BARs (Base Address Registers)

    Starting with native PCI Express GPUs, NVIDIA's GPUs will advertise a
    64-bit BAR capability (a Base Address Register stores the location of a
    PCI I/O region, such as registers or a frame buffer). This means that the
    GPU's PCI I/O regions (registers and frame buffer) can be placed above the
    32-bit address space (the first 4 gigabytes of memory).

    The decision of where the BAR is placed is made by the system BIOS at boot
    time. If the BIOS supports 64-bit BARs, then the NVIDIA PCI I/O regions
    may be placed above the 32-bit address space. If the BIOS does not support
    this feature, then our PCI I/O regions will be placed within the 32-bit
    address space as they have always been.

    Unfortunately, some Linux kernels (such as 2.6.11.x) do not understand or
    support 64-bit BARs. If the BIOS does place any NVIDIA PCI I/O regions
    above the 32-bit address space, such kernels will reject the BAR and the
    NVIDIA driver will not work.

    The only known workaround is to upgrade to a newer kernel.
    Not sure how to check the BIOS support...
    Last edited by BicyclerBoy; January 18th, 2013 at 12:06 AM. Reason: Part of not all..

  9. #9
    Join Date
    May 2006
    Location
    Milwaukee,WI
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    6,098
    Distro
    Xubuntu 14.04 Trusty Tahr

    Re: Missing RAM?

    Quote Originally Posted by ammofreak View Post
    Hi dannyboy79 :
    Thanks for the reply!

    Here is the O/P of cat /proc/meminfo

    Code:
    XXXXXXXXXXXXX ~ $ cat /proc/meminfo
    MemTotal:        3081400 kB
    MemFree:          319540 kB
    Buffers:          253448 kB
    Cached:          1306564 kB
    SwapCached:         4716 kB
    Active:          1521772 kB
    Inactive:         964456 kB
    Active(anon):     579940 kB
    Inactive(anon):   353956 kB
    Active(file):     941832 kB
    Inactive(file):   610500 kB
    Unevictable:       19348 kB
    Mlocked:           19348 kB
    SwapTotal:       1997820 kB
    SwapFree:        1922100 kB
    Dirty:               484 kB
    Writeback:             0 kB
    AnonPages:        941640 kB
    Mapped:           209584 kB
    Shmem:              4276 kB
    Slab:             157788 kB
    SReclaimable:     131004 kB
    SUnreclaim:        26784 kB
    KernelStack:        3408 kB
    PageTables:        28912 kB
    NFS_Unstable:          0 kB
    Bounce:                0 kB
    WritebackTmp:          0 kB
    CommitLimit:     3538520 kB
    Committed_AS:    3785024 kB
    VmallocTotal:   34359738367 kB
    VmallocUsed:      315884 kB
    VmallocChunk:   34359388668 kB
    HardwareCorrupted:     0 kB
    AnonHugePages:         0 kB
    HugePages_Total:       0
    HugePages_Free:        0
    HugePages_Rsvd:        0
    HugePages_Surp:        0
    Hugepagesize:       2048 kB
    DirectMap4k:      162352 kB
    DirectMap2M:     2981888 kB
    yeah, it only shows 3GB, i have no clue man, sorry. maybe 1 of the slots or sticks is bad. try various combinations of 3 sticks to try to find out which stick or slot is bad possibly.
    Check out my Blog about my life and computer software and hardware. http://ubuntuaddicted.blogspot.com/
    My YouTube channel:
    http://www.youtube.com/ubuntuaddicted

  10. #10
    Join Date
    Jan 2013
    Beans
    79
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: Missing RAM?

    What's your motherboard, man?
    AMD Athlon XP 2000+
    ASUS A7V8X-X 2GB DDR
    ATI Radeon 7500 64 MB

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